Portsmouth Earthworks
Aerial illustration of the Portsmouth Earthworks Groups A, B, C, and D | |
| Location | Portsmouth, Ohio, U.S. |
|---|---|
| Region | Southern Ohio and Northeastern Kentucky |
| History | |
| Founded | 100 BCE |
| Abandoned | 500 CE |
| Cultures | Adena culture, Hopewell culture |
| Architecture | |
| Architectural styles | Earthworks, enclosure, causeway, causewayed ring ditch |
| Architectural details | Number of monuments: |
Horseshoe Mound | |
| Location | Scioto County, Ohio |
| Nearest city | Portsmouth, Ohio |
| Coordinates | 38°44′35.70″N 82°58′38.39″W / 38.7432500°N 82.9773306°W |
| Built | 499-0 BCE, 499-0 CE, 1000-500 CE |
| NRHP reference No. | 74001621 |
| Added to NRHP | 1974 |
Portsmouth Earthworks, Group A | |
| Location | Greenup County, Kentucky |
| Nearest city | South Portsmouth |
| Coordinates | 38°43′17.76″N 83°1′22.98″W / 38.7216000°N 83.0230500°W |
| Built | 499-0 BCE, 499-0 CE, 1000-500 CE, 1499-1000 CE, 1749-1500 CE, 1750-1799 CE |
| NRHP reference No. | 80001534 |
| Added to NRHP | December 4, 1980 |
The Portsmouth Earthworks are a large prehistoric mound complex constructed by the Native American Adena and Ohio Hopewell cultures of eastern North America (100 BCE to 500 CE). The site was one of the largest earthwork ceremonial centers constructed by the Hopewell and is located at the confluence of the Scioto and Ohio Rivers, in present-day Ohio.
The majority of the mound complex site is now covered by the city of Portsmouth in Scioto County, Ohio. Several individual sections of the complex have been included on the National Register of Historic Places.